The WF Component API is open and available (somewhere), and you should be able to spin up your own non-FormBuilder comps pretty quickly, provided you have can compile a project to .NET framework 3.5
FormBuilder comps are a little trickier. These comps require renderers/editors in addition to the class, and those classes are sealed in WF (i.e. you can't inherit from them). In this case you have to "roll your own".